Drifters Vol 2

Drifters Vol 2 by Kouta Hirano. A Sci-Fi manga rated Mature, published in English by Dark Horse in 2012.

Mortally wounded in battle, samurai Toyohisa Shimazu is transported to another world, where great warriors from across history have been summoned to fight. Teaming up with Oda Nobunaga and Nasu no Yoichi, he's soon caught in a war against the mysterious Ends. From Kohta Hirano, creator of Hellsing.